diff --git a/Gemfile.lock b/Gemfile.lock
index 5599ea0b..3cfc141e 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -54,7 +54,7 @@ GEM
     rb-fsevent (0.9.5)
     rb-inotify (0.9.5)
       ffi (>= 0.5.0)
-    redcarpet (3.3.1)
+    redcarpet (3.5.1)
     safe_yaml (1.0.4)
     sass (3.4.14)
     timers (4.0.1)
diff --git a/_config.yml b/_config.yml
index 2cad5895..82c3cc7e 100644
--- a/_config.yml
+++ b/_config.yml
@@ -6,3 +6,4 @@ markdown: redcarpet
 encoding: utf-8
 redcarpet:
   extensions: ["no_intra_emphasis", "fenced_code_blocks", "autolink", "tables", "with_toc_data"]
+exclude: [vendor]
diff --git a/html/lesson2/example.html b/html/lesson2/example.html
index f7b409ee..c4ffa714 100644
--- a/html/lesson2/example.html
+++ b/html/lesson2/example.html
@@ -20,8 +20,8 @@ <h2>Why do I like owls so much?</h2>
         <li>and lovely</li>
         <li>and cuddly</li>
       </ol>
-      <div><img src="http://github.com/images/img4.jpg" alt="cute owl"/></div>
-      <div><img src="http://github.com/images/img5.jpg" alt="another cute owl"/></div>
+      <div class="bigimg"><img src="http://github.com/images/img4.jpg" alt="cute owl"/></div>
+      <div class="bigimg"><img src="http://github.com/images/img5.jpg" alt="another cute owl"/></div>
       <a href="http://www.youtube.com/watch?v=gBjnfgnwXic">Watch this video here</a>
       <div id="the-quote">
         <h4>
diff --git a/index.html b/index.html
index 59889c82..34572a5a 100644
--- a/index.html
+++ b/index.html
@@ -24,7 +24,7 @@ <h1>codebar.io</h1>
       <section>
         <p class="lead">
           Are you working on the tutorials on your own time?
-          <a href="https://codebar-slack.herokuapp.com/" target="_blank">Join the codebar community on Slack</a>
+          <a href="https://slack.codebar.io/" target="_blank">Join the codebar community on Slack</a>
           to get help and discuss anything with students or coaches!
         </p>